Fix #108754: remove overactive color management assert

The assert attempted to guard against file formats declaring themselves
as "requiring a float buffer" but outputing to a "byte buffer". However,
DPX seems to permit this and the code seems to support it correctly.

The assert was originally added in 2022 by 5baa3ecda6. Subsequently the
test which exposed the problem was added in 2023 by 7699c7407d. But the
issue at hand has existed since DPX was added; it's the only format with
this combination of capabilities.

Pull Request: https://projects.blender.org/blender/blender/pulls/117914

source/blender/imbuf/intern/colormanagement.cc

@@ -2572,8 +2572,6 @@ ImBuf *IMB_colormanagement_imbuf_for_write(ImBuf *ibuf,
    * display transform for renders, or a user specified color space for the file. */
   const bool byte_output = BKE_image_format_is_byte(image_format);
 
-  BLI_assert(!(byte_output && linear_float_output));
-
   /* If we're saving from RGBA to RGB buffer then it's not so much useful to just ignore alpha --
    * it leads to bad artifacts especially when saving byte images.
    *